[RE-wrenches] Adding battery to grid tie

[Jason Szumlanski]

I like data. Not being able to measure AC coupled PV input is far from my
ideal in my opinion, but when there is no other practical choice, I guess I
would do it. In fact, I have done ita couple of times.


Jason Szumlanski
Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956
Florida Certified Electrical Contractor EC13013208

On Thu, Aug 14, 2025, 10:48 AM Zeke Yewdall via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> While the AC coupled PV system can be added to the AC backed up loads
> panel, this defeats a lot of the functionality of a dedicated AC coupled PV
> array input on the AIOs and is not recommended by most of them.   In
> theory, yes, it works on most inverters to just add it as a negative AC
> load -- and I've even AC coupled an old Trace SW, and it works fine on
> that, despite being designed and built before AC coupling was thought of.
>
> But, if it's just on the AC loads output, the inverter does not have the
> ability to drop the AC PV array separately from the load if it needs to for
> high battery charge regulating, does not have the ability to measure the PV
> array input on monitoring, and may have other issues.
>
> Zeke
>
> > *Subject:* Re: [RE-wrenches] Adding battery to grid tie
> >
> > Correct me if I'm wrong:  I believe AIOs can accept AC coupled power
> > through the load 'output' port. That leaves the Grid and Gen inputs free
> > for their roles as labelled.
> >
> > The AC coupled inverters connect via a breaker in the critical loads
> > panel.
> >
> >
> > William Miller
> > Miller Solar.com
> > 805-438-5600
> > www.millersolar.com
> >
>
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